Flora of North America species comparison

60-250 cm;

internodes not glaucous.

(40)60-150(200) cm, strongly glaucous.

smooth;

ligules 0.6-1 mm;

blades 20-70 cm long, 2-7 mm wide, usually glabrous or scabrous on the margins.

50-500; subtending sheaths 2.5-4.5 cm long, 2-3 mm wide;

peduncles 20-70 mm, with 2(3) rames;

rames 2-4 cm, exerted at maturity;

internodes filiform, densely and evenly pubescent, hairs 3-9 mm.

usually only terminal;

peduncles with 2-7 rames;

rames 4-7(9) cm, exserted at maturity;

internodes usually densely pubescent, hairs 3.7-6.6 mm, often strongly yellowish.

spikelets 3-4 mm; unawned;

callus hairs 0.5-1 mm;

keels of lower glumes scabrous above the midpoint;

anthers 3, 1-1.4 mm.

spikelets (5)6.5-12 mm;

lower glumes often ciliate;

awns absent or to 11 mm;

anthers 3, (2.3)4-6 mm.

spikelets mostly vestigial or absent, 1-2 of those in the terminal units on each rame 3-5 mm and staminate.

spikelets 3.5-12 mm, usually well-developed and staminate.

(0.9)2.5-4.5 mm, ciliate;

blades 3-40(51) cm long, (1.5)2-10 mm wide, often pilose, at least near the collar.

= 60, 120.

= 60 (usually), 70, 100.